function setCookie (cname,cvalue,exdays) {
    var d = new Date();
  d.setTime(d.getTime()+(exdays*24*60*60*1000));
  var expires = "expires="+d.toGMTString();
  document.cookie = cname + "=" + cvalue + "; " + expires;

};

function  getCookie(cname) {
    var name = cname + "=";
    var ca = document.cookie.split(';');
    for(var i=0; i<ca.length; i++) 
    {
      var c = ca[i].trim();
      if (c.indexOf(name)==0) return c.substring(name.length,c.length);
    }
    return "";
};